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Fair Value Measurements and Risk - Gain (Loss) on Nonderivative Instrument (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Cross-currency swap [Member]        
Derivative Instruments, Gain (Loss) [Line Items]        
Amount of Gain (Loss) Recognized in OCI on Derivatives (Effective Portion) $ (7.3) $ (1.8) $ (20.5) $ (1.7)
Foreign currency denominated debt [Member]        
Derivative Instruments, Gain (Loss) [Line Items]        
Amount of Gain (Loss) Recognized in OCI in Currency Translation Adjustments (Effective Portion) (3.1)   (10.3)  
Foreign currency denominated deferred intercompany royalties [Member]        
Derivative Instruments, Gain (Loss) [Line Items]        
Amount of Gain (Loss) Recognized in OCI in Currency Translation Adjustments (Effective Portion) (1.7)   (6.1)  
Net Investment Hedging        
Derivative Instruments, Gain (Loss) [Line Items]        
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net 0.0 0.0 0.0 0.0
Amount of Gain (Loss) Recognized in OCI in Currency Translation Adjustments (Effective Portion) $ (4.8) $ (0.8) $ (16.4) $ (1.2)